Turn Coat (The Dresden Files, Book 11)

The Warden Morgan has been accused of treason against the Wizards of the White Council - and there's only one, final punishment for that crime. He's on the run, wants his name cleared, and needs someone with a knack for backing the underdog. Someone like Harry Dresden...

Long Synopsis:

The Warden Morgan has been accused of treason against the Wizards of the White Council - and there's only one, final punishment for that crime. He's on the run, wants his name cleared, and needs someone with a knack for backing the underdog. Someone like Harry Dresden... Now, Harry must uncover a traitor within the Council, keep a less-than-agreeable Morgan under wraps, and avoid coming under scrutiny himself. And a single mistake may cost someone his head - someone like Harry.